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if the negative cable is all the way down there at the starter, you have a big problem. that puppy is usually either attached to the alt bracket for grounding or intake bolt for grounding.Anyway, it is most likely the postive wire. it can be black or red if the truck is old. Always take the cable off the batter BEFORE working with the starter. Then, no spark.
Nice one...look closely, I'm flipping you off